.main {
    width: 980px;
    height: 455px;
    margin-left: 219px;
    margin-top: 10px;
  }
  
  .focus {
    position: relative;
    width: 721px;
    height: 440px;
    background-color: purple;
    overflow: hidden;
  }
  
  .focus ul {
    position: absolute;
    top: 0;
    left: 0;
    width: 600%;
  }
  
  .focus ul li {
    width: 721px;
    height: 440px;
    background-color: skyblue;
    float: left;
    color: #fff;
    font-size: 100px;
    text-align: center;
    line-height: 440px;
  }
  .focus ul li:nth-child(2) {
    background-color: green;
  }
  .focus ul li:nth-child(3) {
    background-color: brown;
  }
  .focus ul li:nth-child(4) {
    background-color: orange;
  }
  
  .arrow-l,
  .arrow-r {
    display: none;
    position: absolute;
    top: 50%;
    margin-top: -20px;
    width: 24px;
    height: 40px;
    background: rgba(0, 0, 0, 0.3);
    text-align: center;
    line-height: 40px;
    color: #fff;
    font-family: "icomoon";
    font-size: 18px;
    z-index: 2;
  }
  
  .arrow-r {
    right: 0;
  }
  
  .circle {
    position: absolute;
    bottom: 10px;
    left: 50px;
  }
  
  .circle li {
    float: left;
    width: 8px;
    height: 8px;
    /*background-color: #fff;*/
    border: 2px solid rgba(255, 255, 255, 0.5);
    margin: 0 3px;
    border-radius: 50%;
    /*鼠标经过显示小手*/
    cursor: pointer;
  }
  
  .current {
    background-color: #fff;
  }
  